My old employer had electric gates fitted at his premises which worked with two Virgin sim cards which I used to top up and the numbers have been on my records since installation and have stayed on my virgin records even though I retried back in 2016.
Since I left, the house has changed hands but I can see that the sims cards are still being topped up.
I do not know the new residents. Virgin have sent me two new sims cards to replace the old ones that operate the gates. Will the gates still operate with the old cards? All they do is open the gates when the number is dialled. Each card is has a lot of money on it.